Mechanism for sharpening rock-drills.



' No. 815,720. PATENTED MAR. 20, 1906- W. P. LIGHTBODY. MECHANISM FOR SHARPENING ROCK DRILLS.

APPLICATION FILED JULY 2,1904.

' 2 SHEETSSHBET l.

m Iii i Iii Jq i gig! To all whom it may concern;

' Be it known thatI, WILLIAM PARR LIGHT- j UNITED STATES PATENT OFFICE.

WILLIAM. PARR LIGHTBODY, or JOHANNESBURG, TRANSVAAL. MECHANISM FOR SHARPENING ROCK-DRILLS.

I Specification of Letters Patent.

Patented March 20, 1906.

. Application filed m 2, 1904. Serial No. 215,140.

BODY, a subject of the King of Great Britain,

and a resident of Langlaagte Deep, Box 1 ,056, Johannesburg, Transvaal, South Africa, but

at present of Beehive Works, Bolton, in the county ofLancaster, England, haveinvented certain new and useful Improvements in Mechanism for Sharpening Rock-Drills, of

which the following description, together with the accompanying sheets of drawings, is a specification.

MYIIIVGII'UIOD relatesto improvements in mechanismfor use in the process of sharpening rock-drills of the class wherein the cutting edges converge so that'they form a kind of star or cross, the bar of metal out of which they are formedhaving three or four ribs and my'said invention consists in the arrangement of means for acting up on the outer edges 'of thewings or ribs of the drills after they have been treated by other devices forming part of the drill-sharpening process in order to bring them to their proper .or desired radial dimensions. u v

. It is well known in the mining industries that inorder to secure the best results the width or diameter of'the drill should bear a "fixed ratio proportionate to the length of the "drill, and it is oneof the objects of the present "invention to maintain this ratio in the sharpening process.

In the accompanying sheets of drawings, which are illustrative of my said invention, Figure .1 is a front elevation of my improved devices. Fig. 2 is a sectional side elevation thereof. Fig.3 is a plan of parts shown by Figs. 1 and 2. Fi 4 is a. detail drawing 'showin ment 0 which my invention is especially applicable.

the kind 0 rock-drill for the treat- A indicates the base-plate of the machine.

- Upon this I mount my improved'devices, con- Gated through the'same distance vertically:

sisting of the machine E, which is somewhat similar in general construction to the mach ne known as a Ryder sforging-machine,

in which are mounted-the two dies or swages 2 and 3, the former of which is vreciprocated is effected by the longitudinal movement of 5 the wedge 8 in the manner hereinafter de-' scribed. This wedge 8.is adjusted for each different size of drill to be treated by the swages2 and 3. I mount the block 9 and I wedge 10 to intervene between the Wedge 8 and slide 11, and this wedge 10 is connected to the foot-lever 12 (fulcrumed at 13) through the link, 14. The'spring 14 tends to hold said wed e- 10 in'the position indicated by Fig.2, w erein the slide 11 and swage 3 are in their lowered positions. However, on inserting a drill between the swages 2 and 3 and drawin the wedge 10 forward by means of the footever 12 the swage 3 is raised to its proper position for the upper swage 2 to act upon the outer edges of the drills wings or ribs and bring them'to the exact sizes required- The swages 2 and 3 are shaped to form the drill of greater diameter at its outer 4 end than is its body part, so as to allow clearance therefor for purposes well understood.

The releasing of the foot-lever 12 allows the spring 14 to withdraw the wedge 10, causing the slide 11 and swage 3 to be lowered in order that the drill may be withdrawn.

The mechanism hereinbefore described is used in conjunction'with dollying mechanism, whereby the cutting edges of the drill are formed of a certain deslred shape bya die,

and this mechanism consists of a die or dolly 15', which is mounted in bearings 16 and is acted upon by the hammer 17, fixed in the sliding bearings 18, operated by thecrankshaft 19 through the connecting-rod 20. The

drill 21 as it is being acted upon by this device is held by its opposite end, taking within the opening 22 and against the face of the anchorage 23, and in order that drills of different or varied lengths may be acted upon this anchorage or holder 23 is-moved nearer to or farther from the dolly 15, this being efiected by the. rotation of the screw 24, whichmeshes with the nut 2f. (Shown in broken lines, Fig. 3.) The opposite end of the drill rests upon an extension of the dolly-bearing, and the latter serves as a stop for the anchorage 23 when the adjustment of the latter brings the end of the drill against the end wall of the latter is rotated. It will be noted thatwhen the anchorage 23 is adjusted by the hand-wheel 26 for the treatment of any particular drill the wedge 8 is simultaneously moved, so that the swage 3 is in roper position for treating the same dri 1. Hence the lateral dimensions of the rock-drill are automatically adjusted proportionate to its length.

It is well known in the art that rock-drills of the percussion type'i. 6., those operated by a blow from a hammer or some other intermittent forceare of necessity constructed with their cutting edges projecting radially beyond the periphery of the body part in order to allow freedom for the drill to operate and also to enable the clearing out of the substances which have been cut away by the action of the drill. It is also well known that the effect of the wearing or abrading action of the substance being worked is to continually lessen or reduce the length of the radiating ribs or cutting edges, and as a consequence from the beginning of the cutting action until the finish of the same the hole being bored by a drill continually and gradually diminishes in diameter. Now assuming that it is desired to bore a hole four inches in diameter and six or eight feet deep, it is customary to start the work with a drill of not over three feet in length and having cutting ribs of a length equal to the desired diameter and to drill a hole from fifteen to twenty-four inches deep. The first drill is then replaced by another longer drill; but it would not do to have the cutting edges a full four inches across, for the reason that the wear upon the first drill has reduced the diameter of the cutting edge so that the diameter of the hole at the bottom is slightly less than the diameter at the mouth. A full-sized four-inch drill, therefore, would jam in the bottom of the hole and could not be turned after the blow had been imparted thereto. Following out the exam le, the second drill would not exceed five eet in length and would be used until a longer drill was required, which longer drill would of necessity be slightly smaller in diameter than the second, owing to the wear thereon. It is therefore quite apparent that the longer the drill the shorter the diameter thereof must be, clearly showing that the width or diameter of the drill must be 7 roportionate to its length. The shorter t e drill the larger the hole it must make, and, vice versa, the longer the drill the smaller the hole it will have to operate with. In the machine hereinbefore described the parts are so adjusted as to secure these relative proportions.

Having thus described the nature and object of my said invention, what I claim is 1. A machine of the character described comprising oppositely-arranged swaging-dies, means for reciprocating one of said dies,

means for adjusting the other die relatively to said reciprocating die, an adjustable drillcarrier, means for controlling said die-adjusting means, said controlling means being operatively connected to the drill-carrier,whereby movement of the latter is im arted to the former, and means interposed etween said adjustable die and said die-adjusting means to move said die independently of said adjusting means.

2. A machine of the character described comprising an upper reci rocating die, a lower normally stationary ie, an adjustable block for said latter die, a base upon which said block is free to reciprocate, an adjustable drill-carrier mounted independently of said base, means for adjusting said drill-carrier, and independent means for reciprocating said adjusting-block on its base, said block-recipprocating means being operatively connected with said drill-carrier-adj usting means,whereby said parts are adjusted in unison.

3. A machine of the character described comprising an upper reciprocating die, a lower normally stationary die, an adjustable block for said latter die, a base upon which said block is free to reciprocate, an adjustable drill-carrier mounted independently of said base, a hand-wheel for adjusting said drillcarrier, and independent means for reciproeating said block on its base, said means being operatively connected to said hand-wheel, whereby said block and said drill-carrier may be adjusted in unison.

4. A machine of the character described comprising an upper reciprocating die, a lower normally stationary die, an adjustingwedge for the latter die, a feed-screw for said wedge, an adjustable drillcarrier, connections between said drill-carrier and feedscrew, whereby movement of the former is imparted to said screw.

5. A machine of the character described comprising an upper reciprocating die, a lower normally stationary die, an adj ustin wedge for the latter die, an adjustable dril carrier, connections between said carrier and wedge, whereby movement of said carrier is simultaneously imparted to said wedge, and means independent of said adjusting means and interposed between the latter and said lower die for placing said lower die into operative position.

6. A machine of the character described IIO - (mmprising an upper'reciprocating die, a In testimonywhereofThaveaffixed mysig- 'lougler nfOl'minfi staticzinary dieaen adjlustiinfinature in presence of two witnesses.

We 'ge or t e atter ie an a justab e ri i carrier mounted indepeIfdently of said wedge, WILLIAM A LIGHTBODY' and arranged at right angles to the latter, and Witnesses:

means for simultaneously adjusting said drill- SAMUEL HEY,

carrier and Wedge. 7 JAMES HENRY ELLISON. 

